Correct order of spin only magnetic moment of the following complex ions is:

${\left[Fe{F}_6\right]}^{3-}:F{e}^{3+}:3d^5,F^{-1}$   is a weak field ligand.
 
Number of unpaired electrons = 5  $\therefore \mu =\sqrt{35}BM$
  ${\left[Co{F}_6\right]}^{3-}:C{o}^{3+}:3d^6$
 
Number of unpaired electrons = 4  $\therefore \mu =\sqrt{24}BM$
${\left[Co{\left(C_2{O}_4\right)}_3\right]}^{3-}:C{O}^{3+}:3d^6$   Oxalate is a strong field ligand
 
Number of unpaired electrons = 0  $\therefore \mu =0BM$